All OpenStack Charms now contain identical tox.ini files,
not to be modified or made unique within each charm repo.
This is to ensure consistency across charm repos in tox
target naming, approach and purpose, also giving the
charm dev and test experience additional consistency.
Also create empty dirs with .keep files where necessary.
Some classic charms have actions and/or lib dirs, and some
do not. In all classic charms, flake will now check those
dirs to ensure lint coverage of existing or future content.
Change-Id: I2121c10e2547d12c7f818adf237663814b63cf14
Ryan Beisner